Here is my suggestion about ogre's spell:
Fire boulder: Ogre throw fire rocks to the target, make stun for X second and target will take X damage per second
Ogre minion: Call some ogre magi to aid in battle last X second.
Meat lover: Eat meat to restore lost hp for X second.
Morale: Ogre increase his attack, defend, movement speed, and attack speed for X second.
That's all is my suggestion.
Good luck
